Administrator Guide

As a result, PFC and lossless port queues are disabled on 802.1p priorities, and all priorities are mapped to the same priority queue
and equally share the port bandwidth.
• To change the ETS bandwidth allocation congured for a priority group in a DCB map, do not modify the existing DCB map
conguration. Instead, rst create a new DCB map with the desired PFC and ETS settings, and apply the new map to the
interfaces to override the previous DCB map settings. Then, delete the original dot1p priority-priority group mapping.
If you delete the dot1p priority-priority group mapping (no priority pgid command) before you apply the new DCB map,
the default PFC and ETS parameters are applied on the interfaces. This change may create a DCB mismatch with peer DCB
devices and interrupt network operation.
Applying a DCB Map on a Port
To apply a DCB map to an Ethernet port, follow these steps:
Step Task Command Command Mode
1
Enter interface conguration mode on an Ethernet port.
interface {tengigabitEthernet
slot/port |
fortygigabitEthernet slot/
port}
CONFIGURATION
2
Apply the DCB map on the Ethernet port to congure it
with the PFC and ETS settings in the map; for example:
Dell# interface tengigabitEthernet 0/0
Dell(cong-if-te-0/0)# dcb-map SAN_A_dcb_map1
Repeat Steps 1 and 2 to apply a DCB map to more than one
port.
You cannot apply a DCB map on an interface that has been
already congured for PFC using thepfc priority
command or which is already congured for lossless
queues (pfc no-drop queues command).
dcb-map name
INTERFACE
Conguring PFC without a DCB Map
In a network topology that uses the default ETS bandwidth allocation (assigns equal bandwidth to each priority), you can also enable
PFC for specic dot1p-priorities on individual interfaces without using a DCB map. This type of DCB conguration is useful on
interfaces that require PFC for lossless trac, but do not transmit converged Ethernet trac.
Step
Task Command Command Mode
1 Enter interface conguration mode on an Ethernet port.
interface
{tengigabitEthernet
slot/ port |
fortygigabitEthernet
slot/ port }
CONFIGURATION
2 Enable PFC on specied priorities. Range: 0-7. Default:
None.
Maximum number of lossless queues supported on an
Ethernet port: 2.
Separate priority values with a comma. Specify a priority
range with a dash, for example: pfc priority 3,5-7
1. You cannot congure PFC using the pfc
priority command on an interface on which a
pfc priority priority-
range
INTERFACE
902
FC Flex IO Modules